US 12,143,950 B2
Timing alignment handling for configured grant based small data transmissions in inactive mode
Fangli Xu, Beijing (CN); Ralf Rossbach, Munich (DE); Dawei Zhang, Saratoga, CA (US); Haijing Hu, Los Gatos, CA (US); Sarma V. Vangala, Campbell, CA (US); Murtaza A. Shikari, Mountain View, CA (US); and Srinivasan Nimmala, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/438,443
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Jan. 12, 2021, PCT No. PCT/CN2021/071227
§ 371(c)(1), (2) Date Sep. 12, 2021,
PCT Pub. No. WO2022/150955, PCT Pub. Date Jul. 21, 2022.
Prior Publication US 2022/0256484 A1, Aug. 11, 2022
Int. Cl. H04W 76/30 (2018.01); H04W 56/00 (2009.01); H04W 76/10 (2018.01)
CPC H04W 56/001 (2013.01) [H04W 76/10 (2018.02); H04W 76/30 (2018.02)] 9 Claims
OG exemplary drawing
 
1. A baseband processor configured to perform operations comprising:
receiving an indication to release a radio resource control (RRC) connection and to operate in RRC inactive mode, wherein the indication to release the RRC connection configures resources for performing uplink transmissions while in the RRC inactive mode and includes timing configuration information, the timing configuration information comprising a time alignment timer (TAT) value, for use while operating in the RRC inactive mode;
initiating a TAT when releasing the RRC connection using the TAT value provided in the timing configuration information;
maintaining a timing advance while in the RRC inactive mode; and
interfacing with radio frequency (RF) circuitry to perform an uplink transmission using resources configured for performing uplink transmissions while in the RRC inactive mode, wherein the uplink transmission is performed using the timing advance.